Paychex Inc., which did nearly $2 billion in sales in its last fiscal year, said it acquired San Diego-based Hawthorne Benefit Technologies Inc. and its online employee benefits management system, BeneTrac, for an undisclosed price, the company said Sept. 13.

Founded in 1999 by Jerry and Jan Hawthorne, the company had 50 employees, all of whom are being retained by Paychex, which is operating the firm under the name Paychex Benefit Technologies Inc.

With the addition of the new employees, Paychex now has 225 workers in the county.

BeneTrac’s Web-based systems permit administrators and employees 24-hour access to employment and benefits data, the ability to conduct open enrollment sessions online, and do customized reports.

Headquartered in Rochester, N.Y., Paychex is a provider of payroll, human resources and benefits outsourcing systems for small- to medium-sized businesses. For the year ended May 31, the company reported revenue of $1.9 billion, and had more than 12,000 employees working in more than 100 offices nationwide.

— Mike Allen